Drill holder and like tool



June 28, 1949. c. DE LA SOURE E TOOL DRILL HOLDER AND LIK 2 sheets-sheet1 Filed April 9, 1947 R O M w m June 28, 1949. I c. DE LA SOURCE2,474,726

I DRILL HOLDER AND LIKE 'II'OOL Filed April 9, 1947 2 Sheets-Sheet 2 r L.j/NVHVTOR mm; as sou/3c;

Patented June 28, 1949 DRILL HOLDER AND LIKE TOOL Charles de la Source,Paris, France, assignor to Societe: Les Fils de Peugeot Freres,Valentigney, France, a French company Application April 9, 1947, SerialNo. 740,367 In France May 30, 1945 Section 1, Public Law 690, August 8,1946 Patent expires May 30, 1965 1 Claim. 1

The present invention relates to improvements in the construction ofdrill-holders and like toolholders, in which a rotary tool, arranged inthe axis of the instrument, is set in motion by the rotation of alateral hand-crank.

Usually, drill-holders comprise frames which are intended to withstandthe stresses and are closed by covers which do not in any Wayparticipate in the strength of the assembly.

The invention has for its object to provide a structure such that thewhole gear-containing case participates in the bracing of the assembly,thereby enabling the drill-holder to be lightened by making a moreefficient use of the material.

For this purpose, the case comprises two shells or hollow cup-shapedbodies, the cross-sectional shape, theflanges, the ribs, the swagedportions and the assembling elements of which contribute to stand thevarious stresses (bending, twisting, compression) to which thetool-holder may b subjected.

The spindles or other movable members are mounted in ball-bearings so asto increasethe efiiciency of the transmission and allow a wider range ofspeeds between the tool spindle and the hand-crank. The tool may havetwo or three eared up or geared down speeds, thereby providing for moreefficient use of the tools with less fatigue for the operator.

The movable elements are so constructed that taken with reference to theaccompanying drawing which shows, by way of example, various embodimentsof the invention and in which:

Fig. 1 is a general View on a large scale of a drill-holder or braceconstructed in accordance with the invention, the two parts of the casebeing shown spaced apart and separated from the spindles and bearings ofthe mechanism;

Figs. 2 to 11 show various modifications of construction of the case;

Fig. 12 shows an example of construction of the bearings for thespindles of the mechanism;

Fig. 13 is a partial view of a modification of the device for retainingthe balls of a bearing;

Fig. 14 shows another modification of a device of this kind and Figs. 15to 19 show various modifications for the assembling oi ing-c s IReferring to Fig. 1, at E and 2 have been shown two shells or hollowcup-shaped bodies which are adapted to be assembled together along thejunction line AB, AB' so as to form a rigid case. Said shells areprovided with hollow bosses 3, 4, '5, 6 which are intended to increasethe rigidity of the case. Furthermore, the bosses 3 and 6, which have acontinuous bottom, are intended to accommodate one of the bearings l ofa spindle 8 of the mechanism and one of the bearings 9 of anotherspindle it of said mechanism, said spindles supporting intermeshingpinions H and I2 and the spindle H3 furthermore supporting a worm wheelit meshing with a worm Hi secured to the spindle l5 carrying the chuck(not shown) in which the tool clamped.

The boss i with a perforated bottom accommodates the other bearing ll ofthe spindle it and allows a polygonal shank 18 to pass, on which can befixed the crank-handle for driving the tool. Similarly, the boss 5 witha perforated bottom accommodates the other bearing [19 of the spindle (iand allows a second similar polygonal shank 20 to pass.

At 2! and 22 have been shown. the joints which are intended to preventleakages of lubricant and the ingress of dust and at 23 has been shown areinforcing bushing intended to consolidate the assembly of the twoshells i and 2.

If the driving crank is attached to the shank [8, the tool is drivenwith a direct drive; if it is attached to shank 25!, it is driven at ahigher speed ratio (owing to the gear train I I, l 2).

Moreover, as will be seen in Fig. 12, the shanks i8, 253 may be locatedon the same side of the case, provided that the crank is suitably bent.

The shells l and 2, which may be made of cast or stamped metal or ofmoulded plastic material, are assembled together along the plane of thejoint AB, A'B' which is specifically identified in Figure 1, is shown asin Figures 2, 4 and 6, and as in Figure is otherwise illustratedalthough not specifically designated in Figures 7 to 1.1. This plane, asshown in these figures, is a plane of symmetry for the assembled shells,contains the axis of symmetry of the resultant case and the coaxial axisof rotation of the tool-rotating spindle 15 (Figure 1). This method ofassembly permits the release or assembly of all the internal members ofthe case by simply moving said shells away from or towards one another.The case of Fig. 1 has been shown alone, diagrammatically in Fig. 2.

In Fig. 3, the joint plane CD is shown at right angle to that shown inFigure 1, for instance, so

that the axes of the bearings 5, 6, pass through said joint plane CD.Plane CD preserves the characteristics of symmetry and advantagesdescribed in the preceding paragraph.

In Fig. 4, the shells of the case are each formed by two parts 24, 25rigidly fixed to one another by riveting, welding or embedding partslodged in the body of one of the shells. The whole arrangement forms alight assembly which is made very rigid by the spacing apart of theelements 24, 25 forming partitioned compartments which are not readilydeformable by twisting and bending, owing to the increase of the momentsof inertia and of the strength of all the parts of the assembly.

Ribs, such as the one shown at 25 and reinforcing headings such as 2!form bearing, fixing or fastening points for the elements 2 25 andfurthermore serve to absorb the cutting and shearing stresses.

5 and 6 showcases made of moulded material. In Fig. 5, the case isasymmetrical and comprises a main shell 23 provided with the bores 29and accommodating the tool support and the spindle of the chuck and alateral portion 3i which is screwed on the side of the shell 28.Howev'er, as apparent from the drawing, Figure 5, the asymmetry relatesmerely to the shape of the main shell 28 with respect to the lateralcover portion 31; but the assembly of the main shell 2% and cover EHforms, as shown in this figure, a case which on the whole preserves thefeatures of symmetry with respect to the axis of rotation of thetool-rotating spindle. In Fig. 6, the arrangement is symmetrical, with amedial joint plane AB.

7 shows a case comprising a very thin stamped metal plate $2 in whichmoulded material 33 is applied at intervals in order to impart to thiscase the requisite strength. Maximum lightness is thus obtained, sincethe material can be distributed in accordance with the distribution orthe stresses, and the thickness of the case is not limited by questionsof ease of moulding and. fragility.

The moulded material may also be replaced by ribs and bosses of thinstamped and welded sheet metal, when the materials used are suitable forthis purpose. It is possible to rivet the ribs in the case ofnon-weldable metals or of plastic materials.

lhe housings for the movable elements need not be integral with theshells but may be secured thereto according to constructionalfacilities.

Figs. 8 to 11 show various constructions of housings for the bearings orbushings.

In Fig. 8, a bushing 34, performing the function of the boss '4, is setin the wall of the case. In Fig. 9., a stamped cap -35, performing thefunction of the boss 5, merely bears by means of a flange -36 againstthe inner wall of the case and is held in position after assembling byone of the spindles of the mechanism.

In Fig. 10, the boss 3 accommodates a perforated ball which is retainedby a riveted or bolted strap 38 and which acts as a bearing for thespindle, the ball enabling the bearing to be correctlyaligne'd.

In Fig. 11-, the boss 3 is reduced to a slight flange -38 which isformed when punching in the case the hole receiving the spindle. As aresult of the symmetrical construction of the gear andspindle-containing case embodied in the toolhold'er obfiect of theinvention and maximum rigidity thereof, the said case participates inte-.4 grally and to the maximum degree in resisting the various stresses,such as bending, twisting, compression, to which the tool-holder may besubjected during use.

According to another characteristic of the invention, the bearings I, 9,[1, I9 for the spindles of the mechanism are so constructed that theball-cages cannot be removed from the shaft without a special operationwhich cannot occur in an untimely manner during the manipulations formounting or for separating the assembly.

In the example of Fig. 12, the cage 39 of one of the bearings is forcedonto the polygonal shank l8 and falls into a recess 40 cut in thespindle Ill, of such dimensions that it allows the cage to rotateloosely on the balls M and does not allow a sufiicient backward movementof said cage 39 to release the balls, so that said balls always remainconfined in their housing.

The cage l2 of Fig. 12 and the cage 43 of Fig. 13 are respectively heldin position by a Washer it forced into the cage and by a round or squarekeeper or spring 45 housed in a groove of said cage.

Another safety device is represented by a spring t5 pressed in a grooveat the end 0f the spindle ill. Said spring may be replaced by a washerwhich is pressed into its groove like the centering bands ofprojectiles.

As shown at the lower part of Fig. 12 the balls are arranged on acentering member 41 supporting a retaining washer 48 which holds thecage 45;? in position. The whole arrangement is held on the spindle 8 bya spring 50 which is pressed in a groove of the spindle and ensures thecorrect position of the bearing. The cage 5| of the bearing at the otherend of the spindle 8 is held in position by a splayed portion 52 whichprevents the cage 5| from becoming disengaged.

Fig. 14 shows an arrangement in which a tubular distance-piece 53 bearsin a groove 54 of one of the cages 55, and against a back-plate 56confining the balls in the cage 51, so as to hold the cages a fixeddistance apart and center them on the same axis. Nuts 58 serve toadjustthe play of the balls so as to allow free rotation withpractically no play.

This arrangement is particularly suitable for mounting the spindle [5 ofthe chuck accommodating the tool. In this case, the cage 51 and theback-plate 56 absorb the dust produced by the penetration of the tools(drill, milling-cutter and the like) and the cage holds the shaft when atool is put to work and enables it to be withdrawn, while rotating, ifnecessary.

Fig. 1 shows that the spindles 8, It], IE together with the elementssecured thereto can be mounted in one of the shells I and that the othershell 2 can then be mounted so that it encloses the whole arrangementand determines its position.

Assembling may be effected by means of screws, hoops, .interengagement,keeper, rivets, welding, and so forth. If it is desired to have anassembly which can be taken apart or not, use should be made of one ofthe four first means or a combination of these means, or on the contraryrivets gr welds, or both or these means concurrently can use L.

This latter solution may be advantageous for preventing the ingress ofdust or foreign bodies.

It is also possible to contemplate assembling the case by crimping inorder to provide a fluidtight assembly and joints such as 21'22 and i5,

shown in Figure 1, may be fitted in the holes through which the shaftspass.

Fig. 15 shows a fluid-tight closure by means of a keeper 59 and a joint-60 which can be eliminated in certain cases.

Figs. 16 and 17 show closures by means of a joggle 6! and screws 62 orB3.

In Fig. 18, the edge 64 of one of the shells is turned down over theother and thus forms a rugged assembly.

Finally, Fig. 19 shows a closure by means of screws 65 passing through aboss 66 in the alternative of a moulded case (such as that of Fi 6).

This invention is not limited to the details of constructionhereinbefore described, which have only been given by way of example.

Thus, the various methods of assembling the device object of theinvention obviously depend on the external shapes and the above examplescan be modified geometrically, according to the possibilities ofmoulding and spacing, the room available and the beauty of the article.

Having now described my invention what I claim as new and desire tosecure by Letters Patent is:

A portable hand-driven rotary-tool holder comprising two hollowcup-shaped shells forming, when assembled, a rigid and totally enclosedstress-resisting casing. 'parallel transverse spindles and pinionsmounted thereon and a toolrotating spindle geared to said transversespindies and pinions, said transverse spindles, pinions andtool-rotating spindle being substantially contained in said casing, saidcup-shaped shells having their walls symmetrical with respect to theaxis of rotation of said tool-rotating spindle, and being joinedtogether in a plane containing the axis of rotation of saidtool-rotating spindle, each of said cup-shaped shells having tworeinforcing hollow bosses to increase the rigidity of said casing, eachof said transverse spindles extending between two of said bosses, eachof said transverse spindles having at one of its ends a bearing locatedin one of said bosses, and at the other one of its ends a crankhandle-receiving shank extending through the other 0D- posite boss.

CHARLES DE LA SOURCE.

REFERENCES CITED The following references are of record in the file ofthis patent:

FOREIGN PATENTS Number Country Date 499,841 France Nov, 29, 1919 766,759France Apr. 23, 1934

